FEZZ AUDIO Mira Ceti Mono Power Amplifier User Manual
- June 9, 2024
- FEZZ AUDIO
Table of Contents
FEZZ AUDIO Mira Ceti Mono Power Amplifier
TECHNICAL DATA
- Type: stereo vacuum tube mono power amplifier
- Model: Mira Ceti MONO Power amplifier, Evolution line
- Max output power: 1x15W
- Circuit type: PSE Paralell Single Ended
- Output impedance: 4Ω/8Ω
- Inputs: 1xRCA
- Harmonic distortions THD: <0,1%
- Frequency response 12Hz-60kHz (-3dB)
- Power consumption: 115W
- Main AC fuse: 3,15A T
- Net weight: 19,5 kg
- Dimensions (with tubes): 420x380x220mm
- Tubes : 300B x2, 6SN7x2 , automatic bias
SAFETY TIPS
In order to obtain the highest possible sound reproduction quality and for your own safety, please kindly refer to the following
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Never turn on the amplifeir without installed tubes and without hooked-up spekers.
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Never place the Fezz Audio Mira Ceti MONO power amplifier near heat sources, such as radiators, heaters or direct sunlight. Ensure adequate ventilation and airflow
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We also warn against exposure of the amplifier to conditions such as very low temperatures and/or high humidity.
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During normal operation, the vacuum tubes radiate significant amounts of heat – there is a risk of burns.
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The amplifier should be plugged directly into a wall socket. If you must use an extension cord, please make sure that it has load parameters sufficient to ensure proper handling of current delivery to the device.
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When cleaning, always disconnect the Titania amplifier from the power source. Use a dry, soft cloth. Do not use water or cleaning agents.
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If your amplifier starts to misbehave or to work incorrectly, if it’s temperature gets too high or you start feeling smoke – immediately disconnect the device from the mains.
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Due to the risk of exposure to high voltages – please do not open the lid of the amplifier.
ATTENTION: This warning remains in force also in a situation where the device is already disconnected from the wall outlet. -
Always replace fuses in accordance with the original, intended specification.
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Do not make repairs on your own, or adjustments beyond those as described in this manual. Execution of any unauthorized repairs or modifications of the device result in a loss of warranty
INTRODUCTION
New Mira Ceti 300b mono power amplifier A-class is based on legendary direct heated triode 300b vacuum tubes. In standard equipped with anti-vibration feet, adapted to the weight of the device. Backlight logo. Easily accessible fuses protecting the amplifier in case of a power tube failure. Thanks to PSE Parallel Single Ended circuit archtecture and specialy designed output transformer it provides 15W and low THD distortions. Match with dedicated Sagita line pre-amplifier guarantee outstanding sound performace for a reasonable price.
INSTALLATION
UNPACKING
Please kindly check if the packaging of the amplifier has not been damaged
during transit. If you find any damages, please immediately contact your
dealer. Remove the amplifier and accessories from the packaging. Make sure
that the content is not damaged.
Do not connect the device to the power supply if it has visible signs of damage.
PACKAGE CONTENT
The package should contain:
- Fezz Mira Ceti vacuum tube power amplifier
- vacuum tube of type 300B – 2 pcs.
- vacuum tube of type 6SN7 – 2 pcs.
- power cord
- user’s manual
- cotton gloves
- optional: vacuum tube protective cage
If any of the above items are missing in your package, contact your dealer immediately.
VACUUM TUBES INSTALLATION
Place the amplifier on a stable surface. Carefully remove the vacuum tubes from their packaging and install them in the appropriate sockets, as show below, and adhering to the numbering scheme as identified on the packaging.
The pins in the base of each of the vacuum tubes are “coded”, and this has the result that the insertion of the vacuum tube into the socket is possible only in one correct and appropriate orientation. If, whilst inserting the vacuum tube you will sense resistance, and you can not push the tube into the socket, please check the orientation of its pins, rotate the tube to the correct position and try again.
WHERE TO PLACE YOUR POWER AMPLIFIER
Due to the presence of high temperatures during normal operation of the vacuum
tubes, the location that you pick to place your amplifier should ensure ample
ventilation, a free flow of air. Please maintain at least 10 cm clearance
between the housing of the amplifier, together with the vacuum tubes, and
other devices or elements of the interior.
The sound quality may be degraded as a result of vibrations. Therefore we
recommended to place the amplifier on a flat and stable surface.
Never place the amplifier near the source of heat.
DESCRIPTION OF THE POWER AMPLIFIER
- 300B power tubes socket for a left channel
- 6SN7 driver tube socket for a left channel
- 6SN7 driver tube socket for a right channel
- 300B power tubes socket for a right channel
- Output transformers housing
INTERCONNECTIONS
- Source signal input (MONO)
- Speakers outputs
- Ground signal loop ON/OFF
- Main fuse socket
- IEC power supply cord socket
- Mains switch
The figure above shows the rear panel view of the power amplifier, together with a description of the inputs and outputs allowing for connection of the other elements of your audio system
To avoid electrostatic shock to the components of the power amplifier, please touch a grounded conductive surface before making any connections .Any and all connections must be made whilst the device is disconnected from the mains power supply. Before making any such connections, make sure that the amplifier is switched off.
Follow the instructions below to connect Your sound system correctly.
STEP 1 SPEAKERS CONNECTIONS
Check the impedance of the speaker set. Connect the speaker cable to the
appropriate terminals on the rear panel of the amplifier. Depending on the
impedance of the speakers, connect it to the terminal marked either 4 Ω or 8
Ω. If your speaker impedance is 6 Ω – connect the speaker wire to the terminal
8 Ω.
Mira Ceti 300B power amplifier works only in MONO mode. You will need two
devices to make it work in STEREO.
NEVER TURN ON THE POWER AMPLIFIER WITHOUT CONNECTED SPEAKERS
STEP 2 AUDIO SIGNAL SOURCES CONNECTIONS
Connect the line preamplifier or variable output to the input source in the
Mira Ceti 300B power amplifier (1). In order to achieve the highest sound
quality, use only high-quality RCA cables. Pay attention to the proper
connection and distinction of the right (R) and the left (L) channels. For the
best sound quality,
we suggest using the Fezz FAC 01 interconnect cable dedicated for Fezz Audio
vacuum tube amplifiers.
STEP 3 POWER CORD CONNECTION
Make sure that the amplifier is switched off. Connect the power cord to the IEC socket on the rear panel of the amplifier.The amplifier is designed to operate at a rated voltage of 230V / 50-60Hz. Connecting the device to a mains network with incorrect parameters can lead to damage that is not covered by manufacturers warranty.
FIRST POWER-UP AND GETTING
Make sure that all of your wiring is connected in accordance with the
information as provided above on page 5 of this manual.
Turn on the mains power of the Mira Ceti 300B mono power amplifier – the
vacuum tubes shall begin to glow. Make sure that the sound source is turned
on, playing, and then gradually increase the volume level in your
preamplifier.
BURING-IN PROCESS
Any tube amplifier requires an initial pre-heating (or „burn-in”) period, in
order so that it achieves its full sonic potential. This is due to the
presence of residua polarization of dielectric elements and due to a necessary
stabilization of working parameters of the vacuum tubes. The stabilization of
the electrical parameters of the system occurs in a natural process whilst
playing music through your audio system.
A preliminary degree of pre-heating of the amplifier is reached after about 10
hours of quiet music playback. Full sonic capabilities shall stabilize and
unfold within a time-span ranging from
40 to 60 hours of music reproduction at a moderate volume levels.
VACUUM TUBES REPLACEMENT
Your amplifier is equipped with automatic bias module. It’s necessary to use vacuum tubes that have previously been pre-selected and paired up in quads or pairs.
- Disconnect the amplifier from the mains socket, the power supply.
- Remove the currently installed tubes from their respective sockets. Plug in the new replacement vacuum tubes in these sockets.
OPTIONAL EQUIPMENT
VACUUM TUBES PROTECTIVE CAGE
PREMIUM VACUUM TUBES SET
TROUBLE-SHOOTING GUIDE
If your amplifier does not work as it is supposed to, it is fairly easy to diagnose and remedy some of the common malfunctions, by following procedures as outlined in this following.
| TH E PROBLEM | PROBABLE R EASON | SOLUTION |
|---|
After turning the power switch to the ON position, the amplifier does not
switch on.| A blown fuse| Please exchange to faulty fuse to a new one (3,15A
T), within the fuse holder as depicted with index 4 on page 8 of this user’s
manual.
An improper connection of the mains cable| Please check if the plugs of the
mains cable are properly inserted into the electrical mains socket and to the
socket as depicted with index 5 on page 8 of this user’s manual.
The sound produced by the amplifier is distorted. A hum or pops have appeared
and are coming from one of the channels.| An improper placement of the vacuum
tubes in the sockets| Switch off the amplifier. Wait until the vacuum tubes
cool down. Check for proper placement of vacuum tubes in their sockets. If
necessary – correct their orientation.
One of the driver tubes (6SN7) has lost its nominal working parameters| Switch
off the amplifier. Wait until the vacuum tubes cool down. Exchange the
positions of the driver tubes between channels. Turn on the amplifier. If the
disturbing sounds have moved to the other channel, inform Your local Fezz
Audio dealer about tube which need to be replaced.
One of the Power tubes (300B) has lost its nominal working parameters| Switch
off the amplifier. Wait until the vacuum tubes cool down. Exchange the
positions of the power tubes between channels. Turn on the amplifier. If the
disturbing sounds have moved to the other channel, inform Your local Fezz
Audio dealer about tube which need to be replaced.
| After connection to the phono preamp hum from both speakers appeared|
Switch GND signal to ON or OFF postion adapticed with index 4 at page no. 5.
If you have verified the aforementioned situations, and your problem still persists, please contact your local Fezz Audio dealer.-
References
Read User Manual Online (PDF format)
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